Santa Clara, Calif.—National Semiconductor says its LM5005, for easing industrial, automotive, and telecom designs, is the industry's first 75-volt, 2.5-amp integrated buck regulator. "The LM5005 addresses our customers’ requests for a higher-current version of the popular 75-volt, 1-amp LM5010 and 75-volt, 500-mA LM5007 buck regulators," said Paul Greenland, director of strategic marketing for the Power Management Group. "The entire family is highly integrated for a smaller overall footprint, with unique, high-frequency PWM control circuitry that allows our customers to implement step-down switching regulators with minimal filtering and external components."
The LM5005, working from a 7-7.5 volt input (1.225- to 65-volt output), integrates a 75 volt n-channel MOSFET and employs a proprietary scheme that uses emulated, current-mode pulse-width modulation (PWM). This control method generates an internal emulated inductor current ramp, which significantly reduces the sensitivity of the controller to noise. Thus the LM5005 reliably controls very small duty cycles so designers can take full advantage of the LM5005’s wide input voltage and 500 kHz frequency capabilities.
Users can program the operating frequency from 50 to 500 kHz. A bi-directional oscillator synchronization pin allows multiple LM5005 regulators to self-synchronize or switch synchronously with an external clock. Additional protection features include current limit, thermal shutdown and remote shutdown.
The product datasheet is available at www.national.com/pf/LM/LM5005.html. Alternatively, the LM5005 is available for simulation on National’s Webench online design tool at www.national.com/cgi-bin/WebenchTemplate?base_pn=LM5005.
The LM5005, available in a TSSOP-20 package that features an exposed mounting pad to enhance the package’s thermal dissipation, is priced at $3.25 each in 1k-unit quantities.
National Semiconductor, 1-800-272-9959, www.national.com.